Low pressure drag radials ?
Thread Starter
Safety Car
Joined: Aug 2017
Posts: 4,243
Likes: 1,133
From: North Myrtle Beach SC
Low pressure drag radials ?
Will running drag radials at 20 psi affect anything with the electronics or tire pressure system? What about tires that are a half inch taller than factory size (305-35-19)?
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
I've lost the math I did to calculate the tire size differential that will still function without a code, but you can do it yourself.
Using the original OEM tire sizes, find the front tire diameter when new and when bald (aka no tread) and do the same for the rear.
Calculate the ratio of front bald vs new rear and new front vs bald rear.
Any front to rear tire combo ratio that fits within the above ratios will work. How far you can deviate is unknown.
The rear tire size affects the speedometer and therefore the shift points of an automatic. Rather than go in the tune to adjust the tire size when I put on my DR's, I changed my shift points to accommodate the DR's, since I really don't care where those WOT shift points are on my street tires.
Using the original OEM tire sizes, find the front tire diameter when new and when bald (aka no tread) and do the same for the rear.
Calculate the ratio of front bald vs new rear and new front vs bald rear.
Any front to rear tire combo ratio that fits within the above ratios will work. How far you can deviate is unknown.
The rear tire size affects the speedometer and therefore the shift points of an automatic. Rather than go in the tune to adjust the tire size when I put on my DR's, I changed my shift points to accommodate the DR's, since I really don't care where those WOT shift points are on my street tires.
Safety Car
Joined: May 2011
Posts: 3,807
Likes: 508
From: Oshawa, Ontario
it may or may not.every one seems to have a different opinion on the results.my concern is that it may activate one front brake and send you places you don't want to be.I run sensors installed in a pvc tube so all systems in my car are working properly.have been running that way for years and never an issue
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
I didn't get a chance to snap another pic as I passed 90, so this is it.
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Le Mans Master
Joined: Jun 2015
Posts: 6,336
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From: Austin Tx
Depending on the tires you have, you can ruin the sidewalls driving around at that psi all the time. Ruined a set of MT Street S/S tires that had 50% tread life remaining and still hooked great. The whole inner sidewall was cracked.